Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e35d56b82a0d51…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 14:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 407512be4349beffa644161e270f31f8 SHA-1: d9a393d1c973c9566f857987b661bdbba2e21248 SHA-256: f8e35d56b82a0d513db7aac99275b04610fa0e96238755b1d61bce32b33c9023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=name+reactions+of+organic+chemistry+class+12 PDF link annotation
    • http://antifftech.com/uploadfile/file///2021090922024046.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/65322601845.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee7078f2e---27389232084.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/38148807881.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c18cea450---gaxofolexusin.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/96069746004.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/4810579529.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/dowiketewoxetelekuxud.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/23572779408.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/sonavelaxarokotupix.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613860054efda---befuvidev.pdfIn PDF document text
    • https://webhosting4.net/media/file/45652842148.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/78968732337.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/bexobumirovuwomalo.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/biwukegixobolewedolezu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/xugutabujegifewotobibobav1631778567.pdfIn PDF document text
    • https://kawanmto.net/contents/files/wajumutimibobi.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/67680121609.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/wutetegudipemexize.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ur36h1hokjskgm1hejqhbutq34/64182436191.pdfIn PDF document text
    • http://greenglobepms.com/uploads/mezevazakokozibiluwejix.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/46975897161.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/41412287074.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/zipatofi.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/vepukavofudi.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/95946840812.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 18540 bytes
SHA-256: 0d4cb39b87e29a94d3c5554b40cac4f5b317237355b340e30b5a5c98790feb59
font_01_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 11048 bytes
SHA-256: 429d47a3e7c5aa1c77d8ee8123581b10421ce3b7103e5a70b595a85ace21c649

Open this report in the interactive analyzer, or submit your own file for analysis.